In our planet,70% area was covered by sea water. So the earth is called water ball. How to fully use your existing water and realize seawater desalination is the question that mankind has been exploring and improving all the time.Accompanied by continuous improvement of human science and technology,many different water treatment way also occur in this society.Physical treatment, chemical treatment, biological treatment is the most common way, such as MBBR, SBR,Biological aeration method,Biofilm treat and so on.